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Don't sweat it. The more pictures,,,,,,, in focus, (which yours are), the more they get off on it here.
Wait for reply. You'll get your answer in no time at all.
Gonna take a chance and probably come out of this looking like a fool, but it looks like flow marks, from the pressing of the planchet . Under such high pressure, and the positives and negatives of the die, the metal flows outward toward the collar, thus leaving flow marks in that direction.

Gonna take a chance and probably come out of this looking like a fool, but it looks like flow marks, from the pressing of the planchet . Under such high pressure, and the positives and negatives of the die, the metal flows outward toward the collar, thus leaving flow marks in that direction.